<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="./index.css">
</head>

<body>
  <div class="sm-visible md-hide lg-hide xl-hide" style="background-color: red;">只在小屏幕下显示</div>
  <div class="sm-hide md-visible lg-hide xl-visible" style="background-color: aqua;">只在中屏幕和超大屏幕下显示</div>
  <div class="row">
    <div class="xl-6 lg-8 md-12 sm-24">01</div>
    <div class="xl-6 lg-8 md-12 sm-24">02</div>
    <div class="xl-6 lg-8 md-12 sm-24">03</div>
    <div class="xl-6 lg-8 md-12 sm-24">04</div>
    <div class="xl-6 lg-8 md-12 sm-24">05</div>
    <div class="xl-6 lg-8 md-12 sm-24">06</div>
    <div class="xl-6 lg-8 md-12 sm-24">07</div>
    <div class="xl-6 lg-8 md-12 sm-24">08</div>
    <div class="xl-6 lg-8 md-12 sm-24">09</div>
    <div class="xl-6 lg-8 md-12 sm-24">10</div>
    <div class="xl-6 lg-8 md-12 sm-24">11</div>
    <div class="xl-6 lg-8 md-12 sm-24">12</div>
    <div class="xl-6 lg-8 md-12 sm-24">13</div>
    <div class="xl-6 lg-8 md-12 sm-24">14</div>
    <div class="xl-6 lg-8 md-12 sm-24">15</div>
    <div class="xl-6 lg-8 md-12 sm-24">16</div>
    <div class="xl-6 lg-8 md-12 sm-24">17</div>
    <div class="xl-6 lg-8 md-12 sm-24">18</div>
    <div class="xl-6 lg-8 md-12 sm-24">19</div>
    <div class="xl-6 lg-8 md-12 sm-24">20</div>
  </div>
</body>

</html>